Cisco IOS Static Routing with Object Tracking

We will configure Cisco IOS Static Routing with Object Tracking feature in this example.

Here is the topology for this configuration example:

ip sla 1
 icmp-echo 10.10.12.2
 frequency 5
ip sla schedule 1 life forever start-time now

ip route 10.10.10.3 255.255.255.255 10.10.12.2 track 1

R1#show ip sla statistics
Round Trip Time (RTT) for       Index 1
        Latest RTT: 64 milliseconds
Latest operation start time: *03:37:26.803 UTC Fri Nov 1 2011
Latest operation return code: OK
Number of successes: 20
Number of failures: 0
Operation time to live: Forever

R1#show track 1          
Track 1
  Response Time Reporter 1 state
  State is Up
    6 changes, last change 00:02:02
  Latest operation return code: OK
  Latest RTT (millisecs) 32
  Tracked by:
    STATIC-IP-ROUTING 0

R1#show ip route 10.10.10.3
Routing entry for 10.10.10.3/32
  Known via "static", distance 1, metric 0
  Routing Descriptor Blocks:
  * 10.10.12.2
      Route metric is 0, traffic share count is 1

If our next-hop will be unreachable, the static route will not be valid and it will be deleted from the routing table.

Lets remove the IP address of F0/0 of R2

R2(config)#int f0/0
R2(config-if)#no ip address

Then on R1;
*Nov  1 03:39:58.267: %TRACKING-5-STATE: 1 rtr 1 state Up->Down
R1#show ip sla statistics 
Round Trip Time (RTT) for       Index 1
        Latest RTT: NoConnection/Busy/Timeout
Latest operation start time: *03:40:01.803 UTC Fri Nov 1 2011
Latest operation return code: Timeout
Number of successes: 48
Number of failures: 2
Operation time to live: Forever

R1#show track 1           
Track 1
  Response Time Reporter 1 state
  State is Down
    7 changes, last change 00:00:18
  Latest operation return code: Timeout
  Tracked by:
    STATIC-IP-ROUTING 0

R1#show ip route 10.10.10.3
% Subnet not in table